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<div class="title">test_pairs_decoding.cpp</div>  </div>
</div><!--header-->
<div class="contents">
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * Copyright (c) 2015-present, Facebook, Inc.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> * This source code is licensed under the BSD+Patents license found in the</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * LICENSE file in the root directory of this source tree.</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;</div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor">#include &lt;cstdio&gt;</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="preprocessor">#include &lt;cstdlib&gt;</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;</div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor">#include &lt;memory&gt;</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &lt;vector&gt;</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;</div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#include &lt;gtest/gtest.h&gt;</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;</div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#include &lt;faiss/IndexIVF.h&gt;</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="preprocessor">#include &lt;faiss/AutoTune.h&gt;</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="preprocessor">#include &lt;faiss/VectorTransform.h&gt;</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment">/*************************************************************</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment"> * The functions to test, that can be useful in FANN</span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment"> *************************************************************/</span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment">/* Returns the cluster the embeddings belong to.</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment"> * @param index      Index, which should be an IVF index</span></div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment"> *                   (otherwise there are no clusters)</span></div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment"> * @param embeddings object descriptors for which the centroids should be found,</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="comment"> *                   size num_objects * d</span></div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="comment"> * @param cebtroid_ids</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="comment"> *                   cluster id each object belongs to, size num_objects</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="keywordtype">void</span> Search_centroid(<a class="code" href="structfaiss_1_1Index.html">faiss::Index</a> *index,</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;                     <span class="keyword">const</span> <span class="keywordtype">float</span>* embeddings, <span class="keywordtype">int</span> num_objects,</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;                     int64_t* centroid_ids)</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;{</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">float</span> *x = embeddings;</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    std::unique_ptr&lt;float[]&gt; del;</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;    <span class="keywordflow">if</span> (<span class="keyword">auto</span> index_pre = dynamic_cast&lt;faiss::IndexPreTransform*&gt;(index)) {</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;        x = index_pre-&gt;apply_chain(num_objects, x);</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;        del.reset((<span class="keywordtype">float</span>*)x);</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;        index = index_pre-&gt;index;</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    }</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    <a class="code" href="structfaiss_1_1IndexIVF.html">faiss::IndexIVF</a>* index_ivf = <span class="keyword">dynamic_cast&lt;</span><a class="code" href="structfaiss_1_1IndexIVF.html">faiss::IndexIVF</a>*<span class="keyword">&gt;</span>(index);</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    assert(index_ivf);</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    index_ivf-&gt;<a class="code" href="structfaiss_1_1Level1Quantizer.html#a3cf99e2ee92b8558a066f821efab95d5">quantizer</a>-&gt;<a class="code" href="structfaiss_1_1Index.html#a8bc5d8d1cd0dd7b34b3c98a9f76b4a9c">assign</a>(num_objects, x, centroid_ids);</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;}</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="comment">/* Returns the cluster the embeddings belong to.</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="comment"> * @param index      Index, which should be an IVF index</span></div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="comment"> *                   (otherwise there are no clusters)</span></div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="comment"> * @param query_centroid_ids</span></div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="comment"> *                   centroid ids corresponding to the query vectors (size n)</span></div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="comment"> * @param result_centroid_ids</span></div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<span class="comment"> *                   centroid ids corresponding to the results (size n * k)</span></div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="comment"> * other arguments are the same as the standard search function</span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="keywordtype">void</span> search_and_retrun_centroids(<a class="code" href="structfaiss_1_1Index.html">faiss::Index</a> *index,</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;                                 <span class="keywordtype">size_t</span> n,</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;                                 <span class="keyword">const</span> <span class="keywordtype">float</span>* xin,</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;                                 <span class="keywordtype">long</span> k,</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;                                 <span class="keywordtype">float</span> *distances,</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;                                 int64_t* labels,</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;                                 int64_t* query_centroid_ids,</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;                                 int64_t* result_centroid_ids)</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;{</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">float</span> *x = xin;</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;    std::unique_ptr&lt;float []&gt; del;</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    <span class="keywordflow">if</span> (<span class="keyword">auto</span> index_pre = dynamic_cast&lt;faiss::IndexPreTransform*&gt;(index)) {</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;        x = index_pre-&gt;apply_chain(n, x);</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;        del.reset((<span class="keywordtype">float</span>*)x);</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;        index = index_pre-&gt;index;</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;    }</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    <a class="code" href="structfaiss_1_1IndexIVF.html">faiss::IndexIVF</a>* index_ivf = <span class="keyword">dynamic_cast&lt;</span><a class="code" href="structfaiss_1_1IndexIVF.html">faiss::IndexIVF</a>*<span class="keyword">&gt;</span>(index);</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;    assert(index_ivf);</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    <span class="keywordtype">size_t</span> nprobe = index_ivf-&gt;<a class="code" href="structfaiss_1_1IndexIVF.html#affed235eadf27a13d753ee4d33a1dc58">nprobe</a>;</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    std::vector&lt;long&gt; cent_nos (n * nprobe);</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;    std::vector&lt;float&gt; cent_dis (n * nprobe);</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    index_ivf-&gt;<a class="code" href="structfaiss_1_1Level1Quantizer.html#a3cf99e2ee92b8558a066f821efab95d5">quantizer</a>-&gt;<a class="code" href="structfaiss_1_1Index.html#aced51b1ebc33c47ab3ae15ea906559a7">search</a>(</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;        n, x, nprobe, cent_dis.data(), cent_nos.data());</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;    <span class="keywordflow">if</span> (query_centroid_ids) {</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; n; i++)</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;            query_centroid_ids[i] = cent_nos[i * nprobe];</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;    }</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;    index_ivf-&gt;<a class="code" href="structfaiss_1_1IndexIVF.html#ae13fe9ff54a870ded3487c5c282ca566">search_preassigned</a> (n, x, k,</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;                                   cent_nos.data(), cent_dis.data(),</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;                                   distances, labels, <span class="keyword">true</span>);</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; n * k; i++) {</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;        int64_t label = labels[i];</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;        <span class="keywordflow">if</span> (label &lt; 0) {</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;            <span class="keywordflow">if</span> (result_centroid_ids)</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;                result_centroid_ids[i] = -1;</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;        } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;            <span class="keywordtype">long</span> list_no = label &gt;&gt; 32;</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;            <span class="keywordtype">long</span> list_index = label &amp; 0xffffffff;</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;            <span class="keywordflow">if</span> (result_centroid_ids)</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;                result_centroid_ids[i] = list_no;</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;            labels[i] = index_ivf-&gt;<a class="code" href="structfaiss_1_1IndexIVF.html#aa0e8fc5e04cbd8e0dde61f98bc7dd0bc">invlists</a>-&gt;<a class="code" href="structfaiss_1_1InvertedLists.html#a21b52cdb0601cd225bd7924932310876">get_single_id</a>(list_no, list_index);</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;        }</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    }</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;}</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;<span class="comment">/*************************************************************</span></div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;<span class="comment"> * Test utils</span></div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;<span class="comment"> *************************************************************/</span></div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;<span class="comment">// return an IndexIVF that may be embedded in an IndexPreTransform</span></div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;<a class="code" href="structfaiss_1_1IndexIVF.html">faiss::IndexIVF</a> * get_IndexIVF(<a class="code" href="structfaiss_1_1Index.html">faiss::Index</a> *index) {</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;    <span class="keywordflow">if</span> (<span class="keyword">auto</span> index_pre = dynamic_cast&lt;faiss::IndexPreTransform*&gt;(index)) {</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;        index = index_pre-&gt;index;</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;    }</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;    <a class="code" href="structfaiss_1_1IndexIVF.html">faiss::IndexIVF</a>*  index_ivf = <span class="keyword">dynamic_cast&lt;</span><a class="code" href="structfaiss_1_1IndexIVF.html">faiss::IndexIVF</a>*<span class="keyword">&gt;</span>(index);</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;    <span class="keywordtype">bool</span> t = index_ivf != <span class="keyword">nullptr</span>;</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;    assert(index_ivf);</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;    <span class="keywordflow">return</span> index_ivf;</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;}</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;<span class="comment">// dimension of the vectors to index</span></div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;<span class="keywordtype">int</span> d = 64;</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;<span class="comment">// size of the database we plan to index</span></div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;<span class="keywordtype">size_t</span> nb = 8000;</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;<span class="comment">// nb of queries</span></div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;<span class="keywordtype">size_t</span> nq = 200;</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;std::vector&lt;float&gt; make_data(<span class="keywordtype">size_t</span> n)</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;{</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;    std::vector &lt;float&gt; database (n * d);</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; n * d; i++) {</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;        database[i] = drand48();</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;    }</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;    <span class="keywordflow">return</span> database;</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;}</div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;</div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;std::unique_ptr&lt;faiss::Index&gt; make_index(<span class="keyword">const</span> <span class="keywordtype">char</span> *index_type,</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;                                         <span class="keyword">const</span> std::vector&lt;float&gt; &amp; x) {</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;    <span class="keyword">auto</span> index = std::unique_ptr&lt;faiss::Index&gt; (</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;            <a class="code" href="namespacefaiss.html#a0c95ec47726f2ce3fb668dcb1f9a3317">faiss::index_factory</a>(d, index_type));</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;    index-&gt;<a class="code" href="structfaiss_1_1Index.html#abf601502bdbfa02b9d7bcd7b3671b71d">train</a>(nb, x.data());</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;    index-&gt;<a class="code" href="structfaiss_1_1Index.html#a1b5e9ac70adbce0897dd6c8276ad96f2">add</a>(nb, x.data());</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;    <span class="keywordflow">return</span> index;</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;}</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;<span class="comment">/*************************************************************</span></div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;<span class="comment"> * Test functions for a given index type</span></div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;<span class="comment"> *************************************************************/</span></div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;<span class="keywordtype">bool</span> test_Search_centroid(<span class="keyword">const</span> <span class="keywordtype">char</span> *index_key) {</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;    std::vector&lt;float&gt; xb = make_data(nb); <span class="comment">// database vectors</span></div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;    <span class="keyword">auto</span> index = make_index(index_key, xb);</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;    <span class="comment">/* First test: find the centroids associated to the database</span></div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;<span class="comment">       vectors and make sure that each vector does indeed appear in</span></div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;<span class="comment">       the inverted list corresponding to its centroid */</span></div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;</div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;    std::vector&lt;int64_t&gt; centroid_ids (nb);</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;    Search_centroid(index.get(), xb.data(), nb, centroid_ids.data());</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;    <span class="keyword">const</span> <a class="code" href="structfaiss_1_1IndexIVF.html">faiss::IndexIVF</a> * ivf = get_IndexIVF(index.get());</div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;</div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;    <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = 0; i &lt; nb; i++) {</div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;        <span class="keywordtype">bool</span> found = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;        <span class="keywordtype">int</span> list_no = centroid_ids[i];</div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;        <span class="keywordtype">int</span> list_size = ivf-&gt;invlists-&gt;list_size (list_no);</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;        <span class="keyword">auto</span> * list = ivf-&gt;invlists-&gt;get_ids (list_no);</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;        <span class="keywordflow">for</span>(<span class="keywordtype">int</span> j = 0; j &lt; list_size; j++) {</div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;            <span class="keywordflow">if</span> (list[j] == i) {</div>
<div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;                found = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;                <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;            }</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;        }</div>
<div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;        <span class="keywordflow">if</span>(!found) <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;    }</div>
<div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;    <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;}</div>
<div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;</div>
<div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;<span class="keywordtype">int</span> test_search_and_return_centroids(<span class="keyword">const</span> <span class="keywordtype">char</span> *index_key) {</div>
<div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;    std::vector&lt;float&gt; xb = make_data(nb); <span class="comment">// database vectors</span></div>
<div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;    <span class="keyword">auto</span> index = make_index(index_key, xb);</div>
<div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;</div>
<div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;    std::vector&lt;int64_t&gt; centroid_ids (nb);</div>
<div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;    Search_centroid(index.get(), xb.data(), nb, centroid_ids.data());</div>
<div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;</div>
<div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;    <a class="code" href="structfaiss_1_1IndexIVF.html">faiss::IndexIVF</a> * ivf = get_IndexIVF(index.get());</div>
<div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;    ivf-&gt;<a class="code" href="structfaiss_1_1IndexIVF.html#affed235eadf27a13d753ee4d33a1dc58">nprobe</a> = 4;</div>
<div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;</div>
<div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;    std::vector&lt;float&gt; xq = make_data(nq); <span class="comment">// database vectors</span></div>
<div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;</div>
<div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;    <span class="keywordtype">int</span> k = 5;</div>
<div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;</div>
<div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;    <span class="comment">// compute a reference search result</span></div>
<div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;</div>
<div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;    std::vector&lt;long&gt; refI (nq * k);</div>
<div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;    std::vector&lt;float&gt; refD (nq * k);</div>
<div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;    index-&gt;<a class="code" href="structfaiss_1_1Index.html#aced51b1ebc33c47ab3ae15ea906559a7">search</a> (nq, xq.data(), k, refD.data(), refI.data());</div>
<div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;</div>
<div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;    <span class="comment">// compute search result</span></div>
<div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;</div>
<div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;    std::vector&lt;long&gt; newI (nq * k);</div>
<div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;    std::vector&lt;float&gt; newD (nq * k);</div>
<div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;</div>
<div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;    std::vector&lt;int64_t&gt; query_centroid_ids (nq);</div>
<div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;    std::vector&lt;int64_t&gt; result_centroid_ids (nq * k);</div>
<div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;</div>
<div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;    search_and_retrun_centroids(index.get(),</div>
<div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;                                nq, xq.data(), k,</div>
<div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;                                newD.data(), newI.data(),</div>
<div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;                                query_centroid_ids.data(),</div>
<div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;                                result_centroid_ids.data());</div>
<div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;</div>
<div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;    <span class="comment">// first verify that we have the same result as the standard search</span></div>
<div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;</div>
<div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160;    <span class="keywordflow">if</span> (newI != refI) {</div>
<div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160;        <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160;    }</div>
<div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;</div>
<div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;    <span class="comment">// then check if the result ids are indeed in the inverted list</span></div>
<div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160;    <span class="comment">// they are supposed to be in</span></div>
<div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160;</div>
<div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;    <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = 0; i &lt; nq * k; i++) {</div>
<div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;        <span class="keywordtype">int</span> list_no = result_centroid_ids[i];</div>
<div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;        <span class="keywordtype">int</span> result_no = newI[i];</div>
<div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;</div>
<div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;        <span class="keywordflow">if</span> (result_no &lt; 0) <span class="keywordflow">continue</span>;</div>
<div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;</div>
<div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;        <span class="keywordtype">bool</span> found = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;</div>
<div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;        <span class="keywordtype">int</span> list_size = ivf-&gt;invlists-&gt;list_size (list_no);</div>
<div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;        <span class="keyword">auto</span> * list = ivf-&gt;invlists-&gt;get_ids (list_no);</div>
<div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160;</div>
<div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;        <span class="keywordflow">for</span>(<span class="keywordtype">int</span> j = 0; j &lt; list_size; j++) {</div>
<div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160;            <span class="keywordflow">if</span> (list[j] == result_no) {</div>
<div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160;                found = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00248"></a><span class="lineno">  248</span>&#160;                <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160;            }</div>
<div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160;        }</div>
<div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;        <span class="keywordflow">if</span>(!found) <span class="keywordflow">return</span> 2;</div>
<div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;    }</div>
<div class="line"><a name="l00253"></a><span class="lineno">  253</span>&#160;    <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160;}</div>
<div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160;</div>
<div class="line"><a name="l00256"></a><span class="lineno">  256</span>&#160;<span class="comment">/*************************************************************</span></div>
<div class="line"><a name="l00257"></a><span class="lineno">  257</span>&#160;<span class="comment"> * Test entry points</span></div>
<div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;<span class="comment"> *************************************************************/</span></div>
<div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;</div>
<div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;TEST(test_Search_centroid, IVFFlat) {</div>
<div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;    <span class="keywordtype">bool</span> ok = test_Search_centroid(<span class="stringliteral">&quot;IVF32,Flat&quot;</span>);</div>
<div class="line"><a name="l00262"></a><span class="lineno">  262</span>&#160;    EXPECT_TRUE(ok);</div>
<div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;}</div>
<div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160;</div>
<div class="line"><a name="l00265"></a><span class="lineno">  265</span>&#160;TEST(test_Search_centroid, PCAIVFFlat) {</div>
<div class="line"><a name="l00266"></a><span class="lineno">  266</span>&#160;    <span class="keywordtype">bool</span> ok = test_Search_centroid(<span class="stringliteral">&quot;PCA16,IVF32,Flat&quot;</span>);</div>
<div class="line"><a name="l00267"></a><span class="lineno">  267</span>&#160;    EXPECT_TRUE(ok);</div>
<div class="line"><a name="l00268"></a><span class="lineno">  268</span>&#160;}</div>
<div class="line"><a name="l00269"></a><span class="lineno">  269</span>&#160;</div>
<div class="line"><a name="l00270"></a><span class="lineno">  270</span>&#160;TEST(test_search_and_return_centroids, IVFFlat) {</div>
<div class="line"><a name="l00271"></a><span class="lineno">  271</span>&#160;    <span class="keywordtype">int</span> err = test_search_and_return_centroids(<span class="stringliteral">&quot;IVF32,Flat&quot;</span>);</div>
<div class="line"><a name="l00272"></a><span class="lineno">  272</span>&#160;    EXPECT_NE(err, 1);</div>
<div class="line"><a name="l00273"></a><span class="lineno">  273</span>&#160;    EXPECT_NE(err, 2);</div>
<div class="line"><a name="l00274"></a><span class="lineno">  274</span>&#160;}</div>
<div class="line"><a name="l00275"></a><span class="lineno">  275</span>&#160;</div>
<div class="line"><a name="l00276"></a><span class="lineno">  276</span>&#160;TEST(test_search_and_return_centroids, PCAIVFFlat) {</div>
<div class="line"><a name="l00277"></a><span class="lineno">  277</span>&#160;    <span class="keywordtype">int</span> err = test_search_and_return_centroids(<span class="stringliteral">&quot;PCA16,IVF32,Flat&quot;</span>);</div>
<div class="line"><a name="l00278"></a><span class="lineno">  278</span>&#160;    EXPECT_NE(err, 1);</div>
<div class="line"><a name="l00279"></a><span class="lineno">  279</span>&#160;    EXPECT_NE(err, 2);</div>
<div class="line"><a name="l00280"></a><span class="lineno">  280</span>&#160;}</div>
<div class="ttc" id="structfaiss_1_1IndexIVF_html_ae13fe9ff54a870ded3487c5c282ca566"><div class="ttname"><a href="structfaiss_1_1IndexIVF.html#ae13fe9ff54a870ded3487c5c282ca566">faiss::IndexIVF::search_preassigned</a></div><div class="ttdeci">virtual void search_preassigned(idx_t n, const float *x, idx_t k, const idx_t *assign, const float *centroid_dis, float *distances, idx_t *labels, bool store_pairs) const =0</div></div>
<div class="ttc" id="structfaiss_1_1IndexIVF_html"><div class="ttname"><a href="structfaiss_1_1IndexIVF.html">faiss::IndexIVF</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexIVF_8h_source.html#l00166">IndexIVF.h:166</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexIVF_html_affed235eadf27a13d753ee4d33a1dc58"><div class="ttname"><a href="structfaiss_1_1IndexIVF.html#affed235eadf27a13d753ee4d33a1dc58">faiss::IndexIVF::nprobe</a></div><div class="ttdeci">size_t nprobe</div><div class="ttdoc">number of probes at query time </div><div class="ttdef"><b>Definition:</b> <a href="IndexIVF_8h_source.html#l00173">IndexIVF.h:173</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a8bc5d8d1cd0dd7b34b3c98a9f76b4a9c"><div class="ttname"><a href="structfaiss_1_1Index.html#a8bc5d8d1cd0dd7b34b3c98a9f76b4a9c">faiss::Index::assign</a></div><div class="ttdeci">void assign(idx_t n, const float *x, idx_t *labels, idx_t k=1)</div><div class="ttdef"><b>Definition:</b> <a href="Index_8cpp_source.html#l00034">Index.cpp:34</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_abf601502bdbfa02b9d7bcd7b3671b71d"><div class="ttname"><a href="structfaiss_1_1Index.html#abf601502bdbfa02b9d7bcd7b3671b71d">faiss::Index::train</a></div><div class="ttdeci">virtual void train(idx_t n, const float *x)</div><div class="ttdef"><b>Definition:</b> <a href="Index_8cpp_source.html#l00023">Index.cpp:23</a></div></div>
<div class="ttc" id="structfaiss_1_1InvertedLists_html_a21b52cdb0601cd225bd7924932310876"><div class="ttname"><a href="structfaiss_1_1InvertedLists.html#a21b52cdb0601cd225bd7924932310876">faiss::InvertedLists::get_single_id</a></div><div class="ttdeci">virtual idx_t get_single_id(size_t list_no, size_t offset) const </div><div class="ttdef"><b>Definition:</b> <a href="IndexIVF_8cpp_source.html#l00118">IndexIVF.cpp:118</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a1b5e9ac70adbce0897dd6c8276ad96f2"><div class="ttname"><a href="structfaiss_1_1Index.html#a1b5e9ac70adbce0897dd6c8276ad96f2">faiss::Index::add</a></div><div class="ttdeci">virtual void add(idx_t n, const float *x)=0</div></div>
<div class="ttc" id="structfaiss_1_1Index_html_aced51b1ebc33c47ab3ae15ea906559a7"><div class="ttname"><a href="structfaiss_1_1Index.html#aced51b1ebc33c47ab3ae15ea906559a7">faiss::Index::search</a></div><div class="ttdeci">virtual void search(idx_t n, const float *x, idx_t k, float *distances, idx_t *labels) const =0</div></div>
<div class="ttc" id="structfaiss_1_1IndexIVF_html_aa0e8fc5e04cbd8e0dde61f98bc7dd0bc"><div class="ttname"><a href="structfaiss_1_1IndexIVF.html#aa0e8fc5e04cbd8e0dde61f98bc7dd0bc">faiss::IndexIVF::invlists</a></div><div class="ttdeci">InvertedLists * invlists</div><div class="ttdoc">Acess to the actual data. </div><div class="ttdef"><b>Definition:</b> <a href="IndexIVF_8h_source.html#l00168">IndexIVF.h:168</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html"><div class="ttname"><a href="structfaiss_1_1Index.html">faiss::Index</a></div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00060">Index.h:60</a></div></div>
<div class="ttc" id="structfaiss_1_1Level1Quantizer_html_a3cf99e2ee92b8558a066f821efab95d5"><div class="ttname"><a href="structfaiss_1_1Level1Quantizer.html#a3cf99e2ee92b8558a066f821efab95d5">faiss::Level1Quantizer::quantizer</a></div><div class="ttdeci">Index * quantizer</div><div class="ttdoc">quantizer that maps vectors to inverted lists </div><div class="ttdef"><b>Definition:</b> <a href="IndexIVF_8h_source.html#l00033">IndexIVF.h:33</a></div></div>
<div class="ttc" id="namespacefaiss_html_a0c95ec47726f2ce3fb668dcb1f9a3317"><div class="ttname"><a href="namespacefaiss.html#a0c95ec47726f2ce3fb668dcb1f9a3317">faiss::index_factory</a></div><div class="ttdeci">Index * index_factory(int d, const char *description_in, MetricType metric)</div><div class="ttdef"><b>Definition:</b> <a href="AutoTune_8cpp_source.html#l00688">AutoTune.cpp:688</a></div></div>
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